phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('7ccef3c7cc50572d47536e8988f659b0', -1, 1638139910, 1638139910, '3417db0c', -11, 0, 0)

Line : 187
File : sessions.php